You can also save points by attaching the Shas'O to a Crisis suit unit, moving away, firing separately, then assault moving back into coherency.
Nope.
"In order to join a unit, an independent character
simply has to move so that he is within the 2"
coherency distance of a friendly unit at the end of
their Movement phase."
"An independent character may not join or leave a
unit during the Shooting and Assault phases –
once shots are fired or assaults are launched it is
too late to join in or duck out! "